Year % of total population 1960 44.0004738289371 1961 44.1290815552983 1962 44.2533116997649 1963 44.3778597821883 1964 44.4776345960928 1965 44.538005243576 1966 44.57200572841 1967 44.5705741433319 1968 44.5258002241221 1969 44.4409956956222 1970 44.314854094611 1971 44.1490977161727 1972 43.9436095057798 1973 43.6894179722267 1974 43.3850848373919 1975 43.0318362810944 1976 42.6289897287128 1977 42.1789862139401 1978 41.6890629238208 1979 41.1773059513112 1980 40.6630088337304 1981 40.1519151012747 1982 39.6494762946797 1983 39.1657467633421 1984 38.697294368792 1985 38.2350317355199 1986 37.7783983693524 1987 37.330050830761 1988 36.9002151356513 1989 36.4994749919169 1990 36.1180505455685 1991 35.7358495166051 1992 35.3556163486902 1993 34.986813995554 1994 34.6231632445443 1995 34.2574207484572 1996 33.8848909052894 1997 33.5038489330679 1998 33.1121510243827 1999 32.7181018782788 2000 32.3337880153505 2001 31.957590009095 2002 31.5889619016783 2003 31.2299629621248 2004 30.8870780507944 2005 30.5582981534653 2006 30.2492286423318 2007 29.9648357886406 2008 29.6973787338427 2009 29.4418702330557 2010 29.191464054912 2011 28.9536022971941 2012 28.7319081233878 2013 28.5107950792818 2014 28.2816324090319 2015 28.0455237593909 2016 27.7983596254312 2017 27.5405431996529 2018 27.2715868862275 2019 26.9754132987063 2020 26.6787777979979 2021 26.4082162735589 2022 26.1319034550917 2023 25.8294686103324